<template>
  <div class="theme">
    <el-popover placement="top" v-model:value="visible" width="230">
      <div class="themes">
        <div
          class="theme-item"
          :key="index"
          v-for="(themeValue, themeKey, index) in themeMap"
          @click="changeTheme(themeKey)"
        >
          <div class="theme-icon" :style="themeValue.style"></div>
          <p>{{ themeValue.title }}</p>
        </div>
      </div>
      <template v-slot:reference>
        <Icon :backdrop="true" type="skin" />
      </template>
    </el-popover>
  </div>
</template>

<script>
import storage from 'good-storage'
import variables from '@/style/themes/variables'
import variablesWhite from '@/style/themes/variables-white'
import variablesRed from '@/style/themes/variables-red'

const THEME_KEY = '__theme__'
const themes = {
  white: 'white',
  dark: 'dark',
  red: 'red',
}

export default {
  created() {
    this.themeMap = {
      [themes.dark]: {
        title: '深色',
        file: variables,
        style: {
          backgroundColor: '#202020',
        },
      },
      [themes.white]: {
        title: '浅色',
        file: variablesWhite,
        style: {
          backgroundColor: '#f6f6f6',
          border: '1px solid #ebeaea',
        },
      },
      [themes.red]: {
        title: '红色',
        file: variablesRed,
        style: {
          backgroundColor: '#d33a31',
        },
      },
    }
    // 默认浅色
    this.changeTheme(storage.get(THEME_KEY, themes.white))
  },
  data() {
    return {
      visible: false,
    }
  },
  methods: {
    changeTheme(themeKey) {
      storage.set(THEME_KEY, themeKey)
      const theme = this.themeMap[themeKey].file
      Object.keys(theme).forEach((key) => {
        const value = theme[key]
        document.documentElement.style.setProperty(key, value)
      })
    },
  },
}
</script>

<style lang="scss" scoped>
.themes {
  @include flex-center();
  .theme-item {
    @include flex-center(column);
    margin: 0 8px;
    cursor: pointer;

    .theme-icon {
      width: 25px;
      height: 25px;
      border-radius: 50%;
      margin-bottom: 4px;
    }
  }
}
</style>
